WO2023063129A1 - Plaque de polarisation équipée d'une couche de retard et dispositif d'affichage d'image l'utilisant - Google Patents

Plaque de polarisation équipée d'une couche de retard et dispositif d'affichage d'image l'utilisant Download PDF

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WO2023063129A1
WO2023063129A1 PCT/JP2022/036884 JP2022036884W WO2023063129A1 WO 2023063129 A1 WO2023063129 A1 WO 2023063129A1 JP 2022036884 W JP2022036884 W JP 2022036884W WO 2023063129 A1 WO2023063129 A1 WO 2023063129A1
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layer
film
polarizing plate
retardation layer
retardation
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PCT/JP2022/036884
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English (en)
Japanese (ja)
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理 小島
一裕 中島
帆奈美 伊藤
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日東電工株式会社
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Priority to CN202280068406.6A priority Critical patent/CN118103741A/zh
Publication of WO2023063129A1 publication Critical patent/WO2023063129A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Definitions

  • the present invention relates to a polarizing plate with a retardation layer and an image display device using the same.
  • Image display devices represented by liquid crystal display devices and electroluminescence (EL) display devices are rapidly spreading.
  • Polarizing plates and retardation plates are typically used in image display devices.
  • a polarizing plate with a retardation layer, in which a polarizing plate and a retardation plate are integrated, is widely used (for example, Patent Document 1).
  • Thinning of the polarizing plate with the retardation layer can be achieved, for example, by omitting or thinning the protective layer of the polarizing film included in the polarizing plate, or by thinning the retardation layer (retardation film).
  • the polarizing plate provided in the image display device may decolor. Such decoloration is conspicuous in a high-temperature, high-humidity environment.
  • the present invention has been made in view of the above, and its main purpose is to provide a thin polarizing plate with a retardation layer that suppresses decoloration when used in an image display device.
  • a polarizing plate with a retardation layer includes a polarizing film containing iodine and having a first main surface and a second main surface facing each other, and a polarizing film disposed on the first main surface side of the polarizing film, A protective layer having a moisture permeability of 150 g/m 2 ⁇ 24 h or less at 40°C and 92% RH, an adhesive layer disposed on the second main surface side of the polarizing film, the polarizing film and the adhesive layer.
  • the thickness of the laminated portion up to is 50 ⁇ m or less.
  • the polarizing film, the retardation layer, and the inorganic film are arranged in this order.
  • the inorganic film is arranged in direct contact with the retardation layer.
  • the thickness of the inorganic film is less than 400 nm.
  • the inorganic film has a thickness of 50 nm or more.
  • the inorganic film contains at least one selected from the group consisting of silicon oxide, silicon carbide, and composites thereof.
  • the inorganic film is a deposited film.
  • the moisture permeability at 40° C. and 92% RH of the laminated portion from the layer adjacent to the second main surface of the polarizing film to the layer adjacent to the pressure-sensitive adhesive layer is 50 g/m 2 ⁇ 24 h. It is below.
  • the retardation layer is a fixed alignment layer of a liquid crystal compound. According to another aspect of the present invention, an image display device is provided. This image display device has the above polarizing plate with a retardation layer.
  • decoloration can be remarkably suppressed when used in an image display device.
  • FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a polarizing plate with a retardation layer according to one embodiment of the present invention
  • FIG. 1 is a schematic cross-sectional view showing an outline of a state in which a polarizing plate with a retardation layer is arranged on an organic EL panel in an organic EL display device according to one embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a polarizing plate with a retardation layer according to one embodiment of the present invention
  • FIG. 1 is a schematic cross-sectional view showing an outline of a state in which a polarizing plate with a retardation layer is arranged on an organic EL panel in an organic EL display device according to one embodiment of the present invention.
  • refractive index (nx, ny, nz) is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the in-plane direction orthogonal to the slow axis (i.e., fast axis direction) and "nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re( ⁇ )” is an in-plane retardation measured at 23° C. with light having a wavelength of ⁇ nm.
  • Re(550) is the in-plane retardation measured with light having a wavelength of 550 nm at 23°C.
  • Thickness direction retardation (Rth) is the retardation in the thickness direction measured at 23° C. with light having a wavelength of ⁇ nm.
  • Rth(550) is the retardation in the thickness direction measured at 23° C. with light having a wavelength of 550 nm.
  • FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a polarizing plate with a retardation layer according to one embodiment of the present invention.
  • the polarizing plate 100 with a retardation layer includes a polarizing film 11 having a first main surface 11a and a second main surface 11b facing each other, a protective layer 12 disposed on the first main surface 11a side of the polarizing film 11, a polarizing It has a retardation layer 20, an inorganic film 30 and an adhesive layer 40 arranged on the second main surface 11b side of the film 11.
  • FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a polarizing plate with a retardation layer according to one embodiment of the present invention.
  • the polarizing plate 100 with a retardation layer includes a polarizing film 11 having a first main surface 11a and a second main surface 11b facing each other, a protective layer 12 disposed on the first main surface 11a side of the polarizing film 11, a polarizing It has
  • the retardation layer-attached polarizing plate 100 is typically arranged so that the polarizing film 11 is on the viewer side of the retardation layer 20 in the image display device.
  • protective layer 12 is located on the top surface of the image display device.
  • the retardation layer-attached polarizing plate 100 can be obtained, for example, by laminating the polarizing plate 10 obtained by laminating the polarizing film 11 and the protective layer 12 and other layers.
  • the retardation layer 20 has a laminated structure including the first retardation layer 21 and the second retardation layer 22, but unlike the illustrated example, the retardation layer 20 has a lamination structure of three or more layers. It may have a structure or may be a single layer.
  • Each member constituting the polarizing plate with a retardation layer can be laminated via any appropriate adhesive layer (not shown).
  • the adhesive layer include an adhesive layer and an adhesive layer.
  • the protective layer 12 is attached to the polarizing film 11 via an adhesive layer (preferably using an active energy ray-curable adhesive).
  • the retardation layer 20 is attached to the polarizing film 11 via an adhesive layer (preferably using an active energy ray-curable adhesive).
  • the retardation layers are attached to each other, for example, via an adhesive layer (preferably using an active energy ray-curable adhesive).
  • the thickness of the adhesive layer is preferably 0.4 ⁇ m or more, more preferably 0.4 ⁇ m to 3.0 ⁇ m, still more preferably 0.6 ⁇ m to 2.2 ⁇ m.
  • the adhesive layer 40 arranged on the second main surface 11b side of the polarizing film 11 enables, for example, the polarizing plate 100 with the retardation layer to be attached to an image display panel included in the image display device.
  • a release liner is practically adhered to the surface of the pressure-sensitive adhesive layer 40 .
  • the release liner can be temporarily attached until the retardation layer-attached polarizing plate is ready for use.
  • a release liner for example, it is possible to protect the pressure-sensitive adhesive layer and roll-form the retardation layer-attached polarizing plate.
  • An inorganic film 30 is arranged between the polarizing film 11 and the adhesive layer 40 .
  • the decolorization can be suppressed while contributing to thinning of the polarizing plate with the retardation layer.
  • the arrangement of the inorganic film 30 is not particularly limited. is preferably arranged on the side where is not arranged.
  • the inorganic film 30 is arranged, for example, in direct contact with the retardation layer 20 . Such a configuration can contribute to thinning the polarizing plate with the retardation layer.
  • the polarizing plate with a retardation layer may be elongated or sheet-shaped.
  • the term "elongated” refers to an elongated shape whose length is sufficiently longer than its width, for example, an elongated shape whose length is 10 times or more, preferably 20 times or more, its width.
  • the elongated retardation layer-attached polarizing plate can be wound into a roll.
  • the thickness of the laminated portion from the polarizing plate 10 (protective layer 12) to the layer adjacent to the adhesive layer 40 (inorganic film 30 in the illustrated example) is, for example, 60 ⁇ m or less, preferably 50 ⁇ m or less, more preferably 40 ⁇ m or less.
  • Such a thickness contributes to thinning of the image display device, and for example, it may be possible to mount a member (such as a battery) to cope with an increase in size of the screen.
  • a member such as a battery
  • the thickness of the retardation layer-attached polarizing plate is, for example, 10 ⁇ m or more.
  • the thickness of the retardation layer-attached polarizing plate also includes the thickness of the adhesive layer.
  • an adhesive layer that may be placed between the protective layer and the polarizing film, an adhesive layer that may be placed between the polarizing film and the retardation layer, and a retardation layer when the retardation layer has a laminated structure Also included is the thickness of the adhesive layer that may be placed at.
  • the thickness of the retardation layer-attached polarizing plate does not include the thickness of the adhesive layer for adhering the retardation layer-attached polarizing plate to an external adherend such as a panel or glass.
  • the moisture permeability at 40° C. and 92% RH of the laminated portion from the layer adjacent to the second main surface 11b of the polarizing film 11 to the layer adjacent to the adhesive layer 40 is preferably 200 g/m 2 ⁇ 24 h or less, It is more preferably 150 g/m 2 ⁇ 24h or less, still more preferably 100 g/m 2 ⁇ 24h or less, and particularly preferably 50 g/m 2 ⁇ 24h or less.
  • decolorization can be suppressed more effectively. Specifically, decolorization can be effectively suppressed in a high-humidity environment in which generation of ammonia (ammonium ion), which will be described later, can be accelerated.
  • the moisture permeability at 40° C. and 92% RH of the laminated portion from the layer adjacent to the second main surface of the polarizing film to the layer adjacent to the pressure-sensitive adhesive layer is, for example, 1 g/m 2 ⁇ 24 h or more. Note that “adjacent” includes not only direct adjacency but also adjacency via an adhesive layer.
  • the polarizing plate includes a polarizing film and a protective layer.
  • a polarizing plate can be obtained by laminating a polarizing film and a protective layer via an adhesive layer.
  • the polarizing film is typically a resin film containing a dichroic substance. Iodine is preferably used as the dichroic substance.
  • resin films include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
  • the thickness of the polarizing film is preferably 12 ⁇ m or less, more preferably 10 ⁇ m or less, and even more preferably 8 ⁇ m or less. On the other hand, the thickness of the polarizing film is preferably 1 ⁇ m or more.
  • the polarizing film preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizing film is, for example, 41.5% to 48.0%, preferably 42.0% to 46.0%.
  • the polarization degree of the polarizing film is, for example, 90.0% or more, preferably 99.0% or more, and more preferably 99.9% or more.
  • the polarizing film can be produced by any appropriate method. Specifically, the polarizing film may be produced from a single-layer resin film, or may be produced using a laminate of two or more layers.
  • the method of producing a polarizing film from the above single-layer resin film typically includes subjecting the resin film to a dyeing treatment with a dichroic substance such as iodine or a dichroic dye and a stretching treatment.
  • a dichroic substance such as iodine or a dichroic dye
  • a stretching treatment for example, hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films are used.
  • the method may further include an insolubilization treatment, a swelling treatment, a cross-linking treatment, and the like. Since such a manufacturing method is well known and commonly used in the industry, detailed description thereof will be omitted.
  • a polarizing film obtained using the laminate can be produced, for example, using a laminate of a resin substrate and a resin film or resin layer (typically, a PVA-based resin layer).
  • a PVA-based resin solution is applied to a resin base material, dried to form a PVA-based resin layer on the resin base material, and a laminate of the resin base material and the PVA-based resin layer is obtained; stretching and dyeing the laminate to make the PVA-based resin layer into a polarizing film;
  • a PVA-based resin layer containing a halide and a PVA-based resin is formed on one side of the resin substrate. Stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching.
  • stretching may further include stretching the laminate in air at a high temperature (eg, 95° C. or higher) before stretching in an aqueous boric acid solution, if necessary.
  • the laminate is preferably subjected to drying shrinkage treatment in which the laminate is heated while being conveyed in the longitudinal direction to shrink the laminate by 2% or more in the width direction.
  • the manufacturing method of the present embodiment includes subjecting the laminate to an in-air auxiliary stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment in this order.
  • a polarizing plate can be obtained by laminating a protective layer on the peeled surface of the obtained resin substrate/polarizing film laminate, or on the surface opposite to the peeled surface. Details of the method for manufacturing such a polarizing film are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. These publications are incorporated herein by reference in their entireties.
  • the protective layer may be formed of any suitable film that can be used as a protective layer for a polarizing film.
  • suitable film such as triacetyl cellulose (TAC), polyester-based resins such as polyethylene terephthalate, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, and polyethersulfone.
  • TAC triacetyl cellulose
  • polyester-based resins such as polyethylene terephthalate
  • polyvinyl alcohol-based polycarbonate-based
  • polyamide-based polyamide-based
  • polyimide-based polyethersulfone
  • polysulfone-based, polystyrene-based, cycloolefin-based resins such as polynorbornene, polyolefin-based, (meth)acrylic-based, and acetate-based resins.
  • the polarizing plate with a retardation layer according to the embodiment of the present invention is typically arranged on the viewing side of the image display device, and the protective layer is arranged on the viewing side. Therefore, the protective layer may be subjected to surface treatment such as hard coat (HC) treatment, anti-reflection treatment, anti-sticking treatment, anti-glare treatment, etc., if necessary.
  • surface treatment such as hard coat (HC) treatment, anti-reflection treatment, anti-sticking treatment, anti-glare treatment, etc.
  • the thickness of the protective layer is preferably less than 30 ⁇ m, more preferably 28 ⁇ m or less. On the other hand, the thickness of the protective layer is preferably 11 ⁇ m or more, more preferably 13 ⁇ m or more. In addition, when the said surface treatment is performed, the thickness of a protective layer is thickness including the thickness of a surface treatment layer.
  • the moisture permeability of the protective layer at 40° C. and 92% RH is 150 g/m 2 ⁇ 24 h or less, may be 100 g/m 2 ⁇ 24 h or less, or 50 g/m 2 ⁇ 24 h It may be below.
  • at least one selected from cycloolefin-based resins, polycarbonate-based resins, (meth)acrylic-based resins, and polyester-based resins is used as the material constituting the protective layer.
  • ammonia (ammonium ion), which will be described later, is likely to be confined within the polarizing plate (polarizing film) (difficult to be discharged to the outside of the polarizing plate), and decoloration tends to occur. According to the embodiment of the present invention, decolorization can be suppressed even if such a protective layer is provided.
  • the thickness of the retardation layer is preferably 10 ⁇ m or less, more preferably 8 ⁇ m or less, and even more preferably 7 ⁇ m or less, depending on its configuration (whether it is a single layer or has a laminated structure). is. On the other hand, the thickness of the retardation layer is, for example, 0.5 ⁇ m or more.
  • the "thickness of the retardation layer” means the total thickness of each retardation layer. Specifically, the "thickness of the retardation layer" does not include the thickness of the adhesive layer.
  • an alignment solidified layer of a liquid crystal compound (liquid crystal alignment solidified layer) is preferably used.
  • a liquid crystal compound for example, the difference between nx and ny in the resulting retardation layer can be significantly increased compared to a non-liquid crystal material. thickness can be significantly reduced. Therefore, it is possible to realize a remarkable thinning of the polarizing plate with the retardation layer.
  • the term "fixed alignment layer” refers to a layer in which a liquid crystal compound is aligned in a predetermined direction and the alignment state is fixed.
  • the "alignment fixed layer” is a concept including an alignment cured layer obtained by curing a liquid crystal monomer as described later.
  • rod-shaped liquid crystal compounds are typically aligned in the slow axis direction of the retardation layer (homogeneous alignment).
  • the liquid crystal alignment fixed layer is formed by subjecting the surface of a predetermined base material to an alignment treatment, coating the surface with a coating liquid containing a liquid crystal compound, and orienting the liquid crystal compound in a direction corresponding to the alignment treatment. It can be formed by fixing the orientation state. Any appropriate orientation treatment can be adopted as the orientation treatment. Specific examples include mechanical orientation treatment, physical orientation treatment, and chemical orientation treatment. Specific examples of mechanical orientation treatment include rubbing treatment and stretching treatment. Specific examples of physical orientation treatment include magnetic orientation treatment and electric field orientation treatment. Specific examples of chemical alignment treatment include oblique vapor deposition and photo-alignment treatment. Arbitrary appropriate conditions can be adopted as the processing conditions for various alignment treatments depending on the purpose.
  • the alignment of the liquid crystal compound is performed by processing at a temperature that exhibits a liquid crystal phase depending on the type of liquid crystal compound. By performing such a temperature treatment, the liquid crystal compound assumes a liquid crystal state, and the liquid crystal compound is aligned in accordance with the orientation treatment direction of the surface of the base material.
  • the alignment state is fixed by cooling the liquid crystal compound aligned as described above.
  • the orientation state is fixed by subjecting the liquid crystal compound oriented as described above to a polymerization treatment or a crosslinking treatment.
  • liquid crystal compound and details of the method for forming the alignment fixed layer are described in JP-A-2006-163343. The description of the publication is incorporated herein by reference.
  • the retardation layer may be a single layer or may have a laminated structure of two or more layers.
  • the retardation layer when the retardation layer is a single layer, the retardation layer can function as a ⁇ /4 plate.
  • Re(550) of the retardation layer is preferably 100 nm to 180 nm, more preferably 110 nm to 170 nm, still more preferably 110 nm to 160 nm.
  • the thickness of the retardation layer can be adjusted so as to obtain the desired in-plane retardation of the ⁇ /4 plate.
  • the retardation layer is the liquid crystal alignment fixing layer described above, its thickness is, for example, 1.0 ⁇ m to 2.5 ⁇ m.
  • the angle between the slow axis of the retardation layer and the absorption axis of the polarizing film is preferably 40° to 50°, more preferably 42° to 48°, and even more preferably 44°. ° to 46°.
  • the retardation layer preferably exhibits reverse dispersion wavelength characteristics in which the retardation value increases according to the wavelength of the measurement light.
  • the retardation layer 20 when the retardation layer 20 has a laminated structure, the retardation layer 20 includes, for example, a first retardation layer (H layer) 21 and a second retardation layer (Q layer) in order from the polarizing plate 10 side. 22 are arranged in a two-layer laminated structure.
  • the H layer can typically function as a ⁇ /2 plate and the Q layer can typically function as a ⁇ /4 plate.
  • Re(550) of the H layer is preferably 200 nm to 300 nm, more preferably 220 nm to 290 nm, still more preferably 230 nm to 280 nm;
  • Re(550) of the Q layer is preferably It is 100 nm to 180 nm, more preferably 110 nm to 170 nm, even more preferably 110 nm to 150 nm.
  • the thickness of the H layer can be adjusted to obtain the desired in-plane retardation of the ⁇ /2 plate.
  • the H layer is the liquid crystal alignment fixing layer described above, its thickness is, for example, 2.0 ⁇ m to 4.0 ⁇ m.
  • the thickness of the Q layer can be adjusted to obtain the desired in-plane retardation of the ⁇ /4 plate.
  • the Q layer is the liquid crystal alignment fixing layer described above, its thickness is, for example, 0.5 ⁇ m to 2.5 ⁇ m.
  • the angle between the slow axis of the H layer and the absorption axis of the polarizing film is preferably 10° to 20°, more preferably 12° to 18°, still more preferably 12°. ⁇ 16°; the angle formed by the slow axis of the Q layer and the absorption axis of the polarizing film is preferably 70° to 80°, more preferably 72° to 78°, still more preferably 72° ⁇ 76°.
  • each layer may exhibit reverse dispersion wavelength characteristics in which the retardation value increases according to the wavelength of the measurement light. It may exhibit a positive wavelength dispersion characteristic in which the value decreases according to the wavelength of the measurement light, or may exhibit a flat wavelength dispersion characteristic in which the retardation value hardly changes even with the wavelength of the measurement light.
  • the Nz coefficient of the retardation layer is preferably 0.9 to 1.5, more preferably 0.9 to 1.3.
  • the retardation layer is preferably a liquid crystal alignment fixed layer.
  • the liquid crystal compound include a liquid crystal compound having a nematic liquid crystal phase (nematic liquid crystal).
  • a liquid crystal compound for example, a liquid crystal polymer or a liquid crystal monomer can be used. Either lyotropic or thermotropic mechanism may be used to develop the liquid crystallinity of the liquid crystal compound.
  • the liquid crystal polymer and liquid crystal monomer may be used alone or in combination.
  • the liquid crystal monomer is preferably a polymerizable monomer and a crosslinkable monomer.
  • the alignment state of the liquid crystal monomer can be fixed by polymerizing or cross-linking (that is, curing) the liquid crystal monomer. After aligning the liquid crystal monomers, for example, the alignment state can be fixed by polymerizing or cross-linking the liquid crystal monomers.
  • a polymer is formed by polymerization and a three-dimensional network structure is formed by cross-linking, but these are non-liquid crystalline. Therefore, the formed retardation layer does not undergo a transition to a liquid crystal phase, a glass phase, or a crystal phase due to a change in temperature, which is peculiar to liquid crystalline compounds. As a result, the retardation layer becomes a highly stable retardation layer that is not affected by temperature changes.
  • the temperature range in which the liquid crystal monomer exhibits liquid crystallinity differs depending on the type. Specifically, the temperature range is preferably 40°C to 120°C, more preferably 50°C to 100°C, and most preferably 60°C to 90°C.
  • liquid crystal monomer Any appropriate liquid crystal monomer can be adopted as the liquid crystal monomer.
  • polymerizable mesogenic compounds described in JP-T-2002-533742 WO00/37585
  • EP358208 US5211877
  • EP66137 US4388453
  • WO93/22397 EP0261712, DE19504224, DE4408171, and GB2280445
  • Specific examples of such polymerizable mesogenic compounds include LC242 (trade name) available from BASF, E7 (trade name) available from Merck, and LC-Sillicon-CC3767 (trade name) available from Wacker-Chem.
  • a nematic liquid crystal monomer is preferable as the liquid crystal monomer.
  • the inorganic film 30 contains silicon. Specifically, it contains a silicon compound. Silicon compounds include, for example, silicon oxide, silicon carbide, and composites thereof. Preferably, the inorganic film contains at least one selected from the group consisting of silicon oxide, silicon carbide, and composites thereof. Decolorization can be suppressed by providing such an inorganic film.
  • the present inventors faced a new problem that the retardation layer-attached polarizing plate decolors when applied to an image display device (typically, an organic EL display device). As a result of intensive studies on the subject, the inventors discovered that the cause of the decoloration is ammonia (substantially, ammonium ions) derived from the members constituting the image display panel.
  • the inorganic membrane comprises at least one of silicon carbide or silicon carbide oxide. Reliability can be improved by using such materials.
  • the thickness of the inorganic film is, for example, 30 nm or more, preferably 50 nm or more, more preferably 70 nm or more, and still more preferably 90 nm or more. With such a thickness, decolorization can be suppressed more effectively.
  • the thickness of the inorganic film is preferably less than 400 nm, more preferably 350 nm or less, still more preferably 300 nm or less, particularly preferably 250 nm or less, and may be 200 nm or less.
  • the inorganic film can be deposited by any appropriate method.
  • the film can be formed by vacuum deposition, physical vapor deposition such as sputtering, or chemical vapor deposition.
  • chemical vapor deposition plasma chemical vapor deposition (CVD) is preferable from the viewpoint that film formation is possible in a low-temperature process and the object to be film-formed is not damaged by heat.
  • the inorganic film is a deposited film.
  • the inorganic film can be formed directly on the surface of the adjacent layer (for example, retardation layer, polarizing film).
  • the inorganic film may be partially formed in a region overlapping the polarizing film in plan view, but is preferably formed over the entire area.
  • the thickness of the adhesive layer 40 is preferably 10 ⁇ m to 20 ⁇ m.
  • the adhesive layer can be composed of any appropriate adhesive. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives. By adjusting the type, number, combination and compounding ratio of the monomers forming the base resin of the adhesive, as well as the compounding amount of the cross-linking agent, the reaction temperature, the reaction time, etc., an adhesive having desired properties according to the purpose. can be prepared.
  • the base resin of the adhesive may be used alone or in combination of two or more.
  • the base resin is preferably an acrylic resin (specifically, the pressure-sensitive adhesive layer is preferably composed of an acrylic pressure-sensitive adhesive).
  • the polarizing plate with retardation layer according to the embodiment of the present invention can be typically obtained by laminating the polarizing plate and the retardation layer.
  • the lamination of the polarizing plate and the retardation layer is performed, for example, while transporting them by roll (so-called roll-to-roll).
  • Lamination is typically performed by transferring a liquid crystal alignment solidified layer formed on a substrate.
  • each retardation layer may be sequentially laminated (transferred) to the polarizing plate, and a laminate in which the retardation layers are laminated in advance is attached to the polarizing plate. It may be laminated (transferred).
  • the inorganic film can be deposited at an appropriate timing so as to be arranged at a desired position.
  • the film may be formed before laminating the polarizing plate and the retardation layer, or may be formed after laminating the polarizing plate and the retardation layer.
  • an image display device has the retardation layer-attached polarizing plate.
  • FIG. 2 is a schematic diagram showing a schematic configuration of an image display device according to one embodiment of the present invention, using an organic EL display device as an example.
  • an organic EL display device according to one embodiment of the present invention, it is a schematic cross-sectional view showing an outline of a state in which a polarizing plate with a retardation layer is arranged on an organic EL panel.
  • the retardation layer-equipped polarizing plate 100 is arranged so that the inorganic film 30 is closer to the organic EL panel main body 70 than the polarizing film 11 .
  • the retardation layer-equipped polarizing plate 100 is attached to the organic EL panel main body 70 with the adhesive layer 40 .
  • the organic EL panel main body 70 has a substrate 71 and an upper structure layer 72 including a circuit layer including thin film transistors (TFTs) and the like, an organic light emitting diode (OLED), a sealing film for sealing the OLED, and the like.
  • TFTs thin film transistors
  • OLED organic light emitting diode
  • the upper structural layer 72 includes, for example, a nitrogen-containing layer (eg, a nitride layer such as silicon nitride, silicon oxynitride, etc.), and ammonia (ammonium ions) can be generated from the upper structural layer 72 .
  • a nitrogen-containing layer eg, a nitride layer such as silicon nitride, silicon oxynitride, etc.
  • ammonia ammonium ions
  • the thickness and moisture permeability are values measured by the following measuring methods. In addition, unless otherwise specified, "parts" and “%" in Examples and Comparative Examples are by weight. 1. Thickness The thickness of 10 ⁇ m or less was measured using a scanning electron microscope (manufactured by JEOL Ltd., product name “JSM-7100F”). A thickness exceeding 10 ⁇ m was measured using a digital micrometer (manufactured by Anritsu Co., Ltd., product name “KC-351C”). 2. Moisture Permeability Moisture permeability was determined by the cup method (JIS Z 0208).
  • Example 1 Preparation of polarizing plate
  • a thermoplastic resin substrate a long amorphous isophthalic copolymerized polyethylene terephthalate film (thickness: 100 ⁇ m) having a Tg of about 75° C. was used, and one side of this resin substrate was subjected to corona treatment.
  • PVA-based resin obtained by mixing polyvinyl alcohol (degree of polymerization: 4200, degree of saponification: 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOSEFIMER”) at a weight ratio of 9:1.
  • the finally obtained polarizing film is placed in a dyeing bath (iodine aqueous solution obtained by blending iodine and potassium iodide at a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. It was immersed for 60 seconds while adjusting the concentration so that the single transmittance (Ts) was a desired value (dyeing treatment). Next, it was immersed for 30 seconds in a cross-linking bath at a liquid temperature of 40°C (an aqueous solution of boric acid obtained by blending 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water).
  • crosslinking treatment After that, while immersing the laminate in an aqueous solution of boric acid (boric acid concentration: 4% by weight, potassium iodide concentration: 5% by weight) at a liquid temperature of 70° C., the laminate was moved vertically (longitudinally) between rolls with different peripheral speeds. Uniaxial stretching was performed so that the stretching ratio was 5.5 times (underwater stretching treatment). After that, the laminate was immersed in a washing bath (aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 20° C. (washing treatment).
  • a washing bath aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water
  • a COP film (thickness: 27 ⁇ m, transparent at 40° C. and 92% RH) having an HC layer formed thereon was placed on the polarizing film side of the obtained laminate via an ultraviolet curable adhesive (thickness after curing: 1.5 ⁇ m). Humidity: 20 g/m 2 ⁇ 24 h) was laminated as a protective layer. Thereafter, the resin substrate was peeled off from the polarizing film to obtain a polarizing plate having a structure of HC layer/COP film/adhesive layer/polarizing film.
  • the COP film on which the HC layer was formed was obtained by forming a 2 ⁇ m-thick hard coat layer on a cycloolefin-based unstretched film (manufactured by Nippon Zeon Co., Ltd., thickness 25 ⁇ m).
  • Polymerizable liquid crystal exhibiting a nematic liquid crystal phase (manufactured by BASF: trade name “Paliocolor LC242”, represented by the following formula) 10 g, and a photopolymerization initiator for the polymerizable liquid crystal compound (manufactured by BASF: trade name “Irgacure 907 ”) was dissolved in 40 g of toluene to prepare a liquid crystal composition (coating liquid).
  • the surface of a polyethylene terephthalate (PET) film was rubbed with a rubbing cloth and subjected to orientation treatment.
  • the direction of the orientation treatment was set at 15° to the direction of the absorption axis of the polarizing film when viewed from the viewing side when the film was attached to the polarizing plate.
  • the above liquid crystal coating solution was applied to the alignment-treated surface using a bar coater, and dried by heating at 90° C. for 2 minutes to align the liquid crystal compound.
  • the liquid crystal layer thus formed is irradiated with light of 1 mJ/cm 2 using a metal halide lamp to cure the liquid crystal layer, thereby forming a liquid crystal alignment fixed layer A (H layer) on the PET film. bottom.
  • a liquid crystal alignment fixed layer B (Q layer) was formed.
  • a silicon carbide oxide film having a thickness of 50 nm was formed on the surface of the liquid crystal alignment fixed layer B.
  • a polarizing plate laminated with a liquid crystal alignment fixed layer is set in a roll-to-roll CVD film forming apparatus, and after the pressure in the vacuum chamber is reduced to 1 ⁇ 10 ⁇ 3 Pa, while the polarizing plate is running, Hexamethyldisiloxane (HMDSO) and oxygen vaporized by heating, which are film forming materials, were introduced into the chamber under the conditions of a substrate temperature of 12° C., a flow rate of 25 sccm and a flow rate of 700 sccm, respectively, and the pressure was set to about 1.0 Pa to generate plasma.
  • HMDSO Hexamethyldisiloxane
  • oxygen vaporized by heating which are film forming materials
  • a plasma was generated by discharging under the conditions of a power supply frequency of 80 kHz and a power of 1.0 kW to form a film.
  • an adhesive layer having a thickness of 15 ⁇ m was formed on the surface of the silicon carbide oxide film using an acrylic adhesive to obtain a polarizing plate with a retardation layer.
  • the moisture permeability at 40° C. and 92% RH of the laminated portion from the liquid crystal alignment solid layer A to the silicon carbide oxide film was 50 g/m 2 ⁇ 24 h.
  • Example 2 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that the thickness of the silicon carbide oxide film was 200 nm. In the obtained polarizing plate with a retardation layer, the moisture permeability at 40° C. and 92% RH of the laminated portion from the liquid crystal alignment solid layer A to the silicon carbide oxide film was 30 g/m 2 ⁇ 24 h.
  • Example 3 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that the thickness of the silicon carbide oxide film was 400 nm. In the obtained polarizing plate with a retardation layer, the moisture permeability at 40° C. and 92% RH of the laminated portion from the liquid crystal alignment fixed layer A to the silicon carbide oxide film was 20 g/m 2 ⁇ 24 h.
  • Example 1 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that no silicon carbide oxide film was formed.
  • the laminated portion from the liquid crystal alignment fixed layer A to the liquid crystal alignment fixed layer B had a moisture permeability at 40° C. and 92% RH of 400 to 500 g/m 2 ⁇ 24 h.
  • Example 2 A polarizing plate with a retardation layer was obtained in the same manner as in Example 1, except that an organic film having a thickness of 400 nm was formed instead of forming a silicon carbide oxide film having a thickness of 50 nm.
  • acrylic resin manufactured by Kusumoto Kasei Co., Ltd., product name "B-811”
  • thermoplastic epoxy resin manufactured by Mitsubishi Chemical Corporation, trade name "jER (registered trademark) YX6954BH30” 85 parts ( solid content) was dissolved in 80 parts of methyl ethyl ketone to obtain a resin solution (20%).
  • This resin solution was applied to the surface of the liquid crystal alignment fixed layer B using a wire bar, and the applied film was dried at 60° C. for 5 minutes to form an organic film.
  • the moisture permeability at 40° C. and 92% RH of the laminated portion from the liquid crystal alignment fixed layer A to the organic film was 400 to 500 g/m 2 ⁇ 24 h.
  • Example 3 A polarizing plate obtained in the same manner as in Example 1 is laminated with the following retardation film via an acrylic pressure-sensitive adhesive (thickness 5 ⁇ m). ), a 15 ⁇ m-thick adhesive layer was formed on the surface of the liquid crystal alignment fixed layer C with an acrylic adhesive to obtain a polarizing plate with a retardation layer. The retardation film was attached so that the absorption axis of the polarizing film and the slow axis of the retardation film formed an angle of 45°. In the obtained polarizing plate with a retardation layer, the moisture permeability at 40° C. and 92% RH of the laminated portion from the retardation film to the liquid crystal alignment solid layer C was 70 g/m 2 ⁇ 24 h.
  • the coating solution was applied to the vertically aligned PET substrate using a bar coater, and dried by heating at 80° C. for 4 minutes to align the liquid crystal.
  • a liquid crystal orientation fixed layer C thinness 3 ⁇ m
  • a long roll of polyvinyl alcohol (PVA)-based resin film with a thickness of 30 ⁇ m (manufactured by Kuraray, product name “PE3000”) is uniaxially stretched in the longitudinal direction by a roll stretching machine so as to be 5.9 times the length while simultaneously being stretched. After swelling, dyeing, cross-linking, and washing treatments were performed in this order, a drying treatment was finally performed to prepare a polarizing film having a thickness of 12 ⁇ m. In the swelling treatment, the film was stretched 2.2 times while being treated with pure water at 20°C. Next, the dyeing treatment is performed in an aqueous solution at 30° C.
  • PVA polyvinyl alcohol
  • the cross-linking treatment employed two-step cross-linking treatment, and the first-step cross-linking treatment was performed by stretching the film 1.2 times while treating it in an aqueous solution of boric acid and potassium iodide at 40°C.
  • the boric acid content of the aqueous solution for the first-stage cross-linking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the film was stretched 1.6 times while being treated in an aqueous solution of boric acid and potassium iodide at 65°C.
  • the boric acid content of the aqueous solution for the second-stage cross-linking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the washing treatment was carried out with an aqueous potassium iodide solution at 20°C.
  • the potassium iodide content of the aqueous solution for the cleaning treatment was 2.6% by weight.
  • a drying treatment was performed at 70° C. for 5 minutes to obtain a polarizing film.
  • a TAC film (thickness: 25 ⁇ m) having an HC layer (thickness: 7 ⁇ m) and a TAC film having a thickness of 25 ⁇ m were laminated via a polyvinyl alcohol-based adhesive to form an HC layer/TAC.
  • a polarizing plate having a structure of film/adhesive layer/polarizing film/adhesive layer/TAC film was obtained.
  • the moisture permeability at 40° C. and 92% RH of the laminated portion from the TAC film to the liquid crystal alignment solid layer B was 300 to 400 g/m 2 ⁇ 24 h.
  • the degree of polarization of the polarizing plate with a retardation layer after the humidification test was measured.
  • an ultraviolet-visible spectrophotometer manufactured by JASCO Corporation, V-7100 was used to measure the single transmittance Ts, the parallel transmittance Tp, and the orthogonal transmittance Tc, and the degree of polarization P was obtained by the following formula.
  • Ts, Tp and Tc are Y values measured with a JIS Z 8701 2-degree field of view (C light source) and subjected to visibility correction.
  • Degree of polarization P (%) ⁇ (Tp-Tc)/(Tp+Tc) ⁇ 1/2 ⁇ 100 2.
  • Example 3 the degree of polarization after the humidification test was maintained at 99% or more, indicating that decolorization was suppressed. In Example 3, cracks were confirmed in the reliability evaluation.
  • a polarizing plate with a retardation layer according to an embodiment of the present invention is used in an image display device, and can also be suitably used in a curved, bendable, foldable, or rollable image display device.
  • Typical image display devices include liquid crystal display devices, organic EL display devices, and inorganic EL display devices.

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  • Physics & Mathematics (AREA)
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  • Spectroscopy & Molecular Physics (AREA)
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Abstract

La présente invention concerne une plaque de polarisation équipée d'une couche de retard mince dans laquelle la décoloration de la plaque lorsqu'elle est utilisée dans un dispositif d'affichage d'image est supprimée. Une plaque de polarisation équipée d'une couche de retard selon un mode de réalisation de la présente invention comprend : un film polarisant qui contient de l'iode et a une première surface principale et une seconde surface principale sur des côtés opposés l'un de l'autre ; une couche de protection qui est disposée sur le premier côté de surface principale du film polarisant et a une perméabilité à l'humidité à 40 °C et 92 % RH de pas plus de 150 g/m2·24h ; une couche adhésive qui est disposée sur le second côté de surface principale du film polarisant ; une couche de retard qui est disposée entre le film polarisant et la couche adhésive ; et un film inorganique qui contient du silicium et est disposé entre le film polarisant et la couche adhésive, l'épaisseur de la section de couches de la couche de protection à la couche adjacente à la couche adhésive n'étant pas supérieure à 50 µm.
PCT/JP2022/036884 2021-10-13 2022-10-03 Plaque de polarisation équipée d'une couche de retard et dispositif d'affichage d'image l'utilisant WO2023063129A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0259336A (ja) * 1988-08-24 1990-02-28 Mitsubishi Monsanto Chem Co 偏光フィルム
WO2016043240A1 (fr) * 2014-09-17 2016-03-24 株式会社巴川製紙所 Film protecteur, corps recouvert d'un film, et plaque de polarisation
JP2016105166A (ja) * 2014-11-20 2016-06-09 日東電工株式会社 有機ｅｌ表示装置用円偏光板および有機ｅｌ表示装置
JP2017049536A (ja) * 2015-09-04 2017-03-09 日東電工株式会社 偏光板、反射防止積層体及び画像表示システム
WO2018190180A1 (fr) * 2017-04-13 2018-10-18 日東電工株式会社 Polariseur, dispositif d'affichage d'image et procédé de fabrication dudit dispositif d'affichage d'image
CN210626704U (zh) * 2019-11-29 2020-05-26 昆山工研院新型平板显示技术中心有限公司 偏光片和显示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0259336A (ja) * 1988-08-24 1990-02-28 Mitsubishi Monsanto Chem Co 偏光フィルム
WO2016043240A1 (fr) * 2014-09-17 2016-03-24 株式会社巴川製紙所 Film protecteur, corps recouvert d'un film, et plaque de polarisation
JP2016105166A (ja) * 2014-11-20 2016-06-09 日東電工株式会社 有機ｅｌ表示装置用円偏光板および有機ｅｌ表示装置
JP2017049536A (ja) * 2015-09-04 2017-03-09 日東電工株式会社 偏光板、反射防止積層体及び画像表示システム
WO2018190180A1 (fr) * 2017-04-13 2018-10-18 日東電工株式会社 Polariseur, dispositif d'affichage d'image et procédé de fabrication dudit dispositif d'affichage d'image
CN210626704U (zh) * 2019-11-29 2020-05-26 昆山工研院新型平板显示技术中心有限公司 偏光片和显示装置

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